I just dealt with the robot army and killed Benny, got sent by Caesar to kill Mr. House.... But, problem is, I never got my weapons back. I've exited Caesar's tent many times over and even the whole fort, but I still don't get my guns back. I feel that I have encountered a bug here, so I ask for help.

I'm on PC and was rather good with Fallout 3 modding, so console commands/GECK are an option here.

There are some large crates near the gate and the key was on a body near the gate. Are they in there? I've never done it the way you did it. We just take the barge to the Fort and wipe it out. They never get my weapons but I remember those crates.

Try to fast travel and see if it all shows up afterwards.

You don't get your weapons back until you go back to Cottonwood Cove.